SU1615840A1 - Rotor of induction motor - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to reduce the size of the rotor by reducing the width of the grooves. The ribbed gear magnetic core of the asynchronous electric motor consists of two parts 2 and 3, which are offset from each other in the tangential direction by half of the tooth division. Between parts 2 and 3 there is a ring 4. A two-layer winding of rods is placed in the grooves of the magnetic circuit. At the ends of the rotor, the upper parts 5 of the rods and the lower parts 6 of the winding rods are connected to short-circuited rings 7 and 8. When they leave the grooves, parts 5 and 6 of the winding rods of the part 2 of the magnetic core intersect in the space above the ring 4 and are shifted into the slots with a half shift. Part 3 of the magnetic circuit, swapped by the height of the groove. The invention allows to improve the vibro-acoustic characteristics of an electric motor. 2 Il.

Description

1

The invention relates to electrical engineering and can be used in the development, to the design of rotors of short-circuited asynchronous electric motors.

The purpose of the invention is to reduce the size of the rotor by reducing the width of the grooves.

MS figure 1 shows the rotor of an asynchronous electric motor, a longitudinal section; FIG. 2 is a schematic of a rotor winding of an induction motor for the case when the number of slots of the rotor is sixteen.

On the shaft 1 of the rotor of the asynchronous electric motor there is a laminated gear magnetic conductor, consisting of two parts 2 and 3 displaced by half a tooth division, relative to the other in the tangential direction, between which (there is a laminated ring 4, the outer surface of which is located at the bottom of the grooves of parts 2 and 3 of the laminated toothed magnetic circuit. In the slots of parts 2 and 3 there is a two-layer winding comprising the upper parts of 5 rods and the lower parts of 6 rotor rods from an insulated rectangular cable section. At the rotor ends of the upper part 5 and lower part of the rods the rods 6 connected to a two-layer winding korotkozamy- repentieth rings 7 and 8.

The grooves 2.1-2.16 (Fig. 2) relate to the part 2 of the laminated magnetic circuit, and the grooves 3.1-3.16 relate to the part 3 of the laminated toothed magnetic conductor intersecting part 2 into half of the tooth division. The solid lines show the upper parts of the 5 rotor winding rods, and the dotted lines show the lower parts of the 6 rotor winding rods.

The rods are laid into the grooves of the proposed rotor as follows.

First, the upper part 5 of the rod is laid in the slots 2.1-3.1 with its lower part 6 in the groove 3.1. Then, the lower part 6 of the rod is placed in the grooves 3.1-2.2 with its upper part 5 in the groove 3.1, and the lower part 6 in the groove 2.2, etc. When laying the last rod in the grooves 3.16-1.1, it is necessary to bring its lower part 6 under the upper part 5 of the first rod into the grooves 2.1 - 3.1.

In the proposed rotor of the asynchronous electric motor, the upper parts of 5 rods are lower parts of 6 rods of the winding, located in part 2 of the toothed laminated

When exiting the grooves of this part, the magnetic conductor intersects in the space above the laminated ring 4 and with a shift by half of the teeth division are placed in the adjacent grooves of the part 3 of the laminated magnetic conductor, changing places along the height of the groove.

Thus, by providing a cross between the winding bars outside the slot space, the dimensions of the slots in the rotor

reduced by at least a factor of two, which leads to a reduction in the size of the rotor. A more complete filling of the slots with copper increases the useful power of the asynchronous electric motor or its efficiency.

In addition, the vibro-acoustic characteristics of the asynchronous electric motor are improved, as the rotor slots are shifted by half the tooth division, which weakens the higher harmonic components of the moments and forces that cause the magnetic noise of the electric machine.

Claims (1)

Formula from the acquisition of the rotor of an asynchronous electric motor, containing a laminated serrated magnetowire, in the slots of which a two-layer winding is placed, consisting of isolated upper and lower rods of rectangular cross section, intersected in the middle of the rotor and connected at its ends with short-circuiting rings, due to the fact that in order to reduce the size of the rotor by reducing the width of the grooves, the toothed magnetic core is divided in axial direction into two equal parts, displaced one relative to the other in the tangential direction by half the tooth division, between With which the laminated ring with the outer surface at the bottom of the grooves is located, above which the upper and lower rods of each groove of one part of the toothed magnetic core intersect and pass into two adjacent grooves of the other part of the toothed magnetic conductor.